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Biochemical Engineering
‣
Downstream Processing
Comments
Question
Concentration polarization can be reduced further by
Options
A. pre filtering the solution
B. reducing the flow rate per unit membrane surface area
C. back washing periodically
D. all of the above
Correct Answer
all of the above
Downstream Processing problems
Search Results
1. Selectivity can be expressed as
Options
A. ratio of the distribution coefficients in different solute
B. mass fraction of the solute in the extract phase at equilibrium
C. mass fraction of the solute in the raffinate phase
D. ratio of the mass fraction of the solute in the extract phase to the raffinate phase
Show Answer
Scratch Pad
Discuss
Correct Answer: ratio of the distribution coefficients in different solute
2. Start up expenses in a fermentation industry varies from
Options
A. 0-5% of the capital cost
B. 10-15% of the capital cost
C. 5-10% of the capital cost
D. 15-20% of the capital cost
Show Answer
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Discuss
Correct Answer: 5-10% of the capital cost
3. The purity of a solute collected between two times
t
1
and
t
2
during chromatographic separation can be calculated as
Options
A. amount of solute eluted - amount of impurity eluted
B. amount of solute eluted / amount of impurity eluted
C. amount of solvent eluted + amount of impurity eluted
D. amount of solvent eluted / amount of impurity eluted
Show Answer
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Discuss
Correct Answer: amount of solute eluted / amount of impurity eluted
4. The stage wise operation of adsorption is called
Options
A. contact filtration
B. conventional adsorption
C. affinity adsorption
D. ion exchange
Show Answer
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Discuss
Correct Answer: contact filtration
5. Maintenance cost varies from
Options
A. 0-4% of the capital cost
B. 12-16% of the capital cost
C. 4-8% of the capital cost
D. 8-12% of the capital cost
Show Answer
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Discuss
Correct Answer: 4-8% of the capital cost
6. The solvent flux across the membrane can be expressed as (where
A
is the area,
L
p
is the membrane permeability, ? is the reflection point, ?
p
is applied pressure and ?? is the osmotic pressure)
Options
A.
J
=
L
p
(?
p
- ???)
B.
J/A
=
L
p
(?
p
- ???)
C.
J
=
L
p
/???
D.
J/A
=
L
p
/?
p
Show Answer
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Discuss
Correct Answer:
J
=
L
p
(?
p
- ???)
7. A typical tubular centrifuge has a bowl of 2 to 5 inch in diameter and 9 to 30 inch in height with a maximum rotating speed of
Options
A. 15,000 to 50,000 rpm
B. 50,000 to 100,000 rpm
C. 100,000 to 150,000 rpm
D. 150,000 to 200,000 rpm
Show Answer
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Discuss
Correct Answer: 15,000 to 50,000 rpm
8. The disk centrifuge is the type of centrifuge used most often for bio separations due to its
Options
A. continuous operation
B. lesser cost
C. higher speed
D. ease in operation
Show Answer
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Discuss
Correct Answer: lesser cost
9. Which of the following is not the physical method for the cells rupturing?
Options
A. Milling
B. Homogenization
C. Ultrasonication
D. Enzymatic digestion
Show Answer
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Discuss
Correct Answer: Enzymatic digestion
10. The optimum wet solid content for the cell suspension for a bead mill is typically somewhere between
Options
A. 5-15% by volume
B. 15-30% by volume
C. 30-60% by volume
D. 60-90% by volume
Show Answer
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Discuss
Correct Answer: 30-60% by volume
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